Drop volume Tensiometer TVT

Measuring of surface and interfacial tension

LAUDA drop volume tensiometers serve to measure the surface and interfacial tension of liquids. The method is especially suited to determining dynamic interfacial tensions. Here, the volume of a drop detaching from the needle is measured very precisely. The surface/interfacial tension is derived from this depending on whether the drop forms in air or in a second non-miscible phase (oil). This measurement principle is in an easy-to-operate measuring unit using precision mechanics and modern electronics. The microliter-precise drop formation ensures the outstanding precision and reproducibility of the measured values. With the highly stable Phase-Locked Loop (PLL) speed controller of the direct-current motor, drops can be formed with a lifespan from one second up to a number of hours without vibrations. The analysis of these effects is especially important when it comes to time-limited surfactant effects, like, for example, with quick coating processes, drop formation, wetting processes or with emulsion stability.

Your advantages at a glance

Your advantages at a glance

The TVT advantages Your benefits
Drop volume Tensiometer TVT
  • Drop volume method for precise measurement of surface and interfacial tension
  • Measurement range: 100 to 0.1 mN/m
  • Flexible device for a variety of applications
  • Characterization of multiple emulsifiers, for which the ring/plate technology cannot be used
Drop volume Tensiometer TVT
  • Dynamic surface and interfacial tension depending on the drop age across a wide range
  • Quick overview of adsorption behavior of amphiphilic molecules on surfaces and interfaces
Drop volume Tensiometer TVT
  • Extremely robust and controlled via intuitive Windows software
  • Temperature control with LAUDA thermostats
  • Can also be operated by untrained staff
  • No particular requirements of setup area
  • Automatic recording of temperature independence
Drop volume Tensiometer TVT
  • Different views of the measurement curves and fitting of polynomial functions for analyzing the measurement data
  • Physically founded extrapolations beyond the measurement range to compare with other methods
Drop volume Tensiometer TVT
  • Various syringes and needle combinations
  • Special needles for rising drops or glass needles
  • Easy replacement and cleaning
  • Flexible and fast switching between applications
  • Optimization of the measurement process
  • Particle-holding and critical samples also measurable, e.g. crude oils and strong acids
  • Insensitive measuring element, no annealing necessary
  • Gas-proof closing of the system
  • Liquid-thermostated measuring cell and dosing syringe
  • Safe measurements of volatile and/or toxic substances
  • Exact thermostating at the measuring cell using LAUDA thermostats

Drop volume Tensiometer TVT

Technical Data
Product Name LAUDA TVT 2/E LAUDA TVT 2/M
Measuring range min. mN/m 0.10 0.10
Measuring range max. mN/m 100 100
Resolution Hub 0.10 0.10
Resolution Volume µl 0.01 0.01
Resolution surface tension/tension limit mN/m 0.01 0.01
Drop formation time s 0.10 0.10
Absolute accuracy Approx. 0.5 % of the end value of the surface tension  
Drop times 0.04 (at 5 ml); 170 (at up to 0.25 ml)  
Speed control < 0.1 < 0.1